الفهرس 
CORONAVIRUS DISEASE 2019 (COVID-19)Only 14 pages are availabe for public view
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Abstract
Background: The COVID-19 pandemic is one of the worst pandemics of recent times. Vaccination is a preventative strategy for prevention and control of infection. This study aimed to measure the reinfection and vaccination rates among COVID-19 patients who were admitted to Ain Shams University (ASU) Hospitals during the pre-vaccination era and correlate their vaccination status with the incidence and severity of the reinfection.
Methods: A retrospective cohort study was conducted that includes patients diagnosed with SARS-CoV-2 infection and admitted to ASU Hospitals during the pre-vaccination era. Data about the first COVID-19 infection were extracted from the patient’s records and then a random sample of patients was selected and data about vaccination and re-infection rates was collected from them through an interview questionnaire.
Results: 340 out of the 400 included subjects received COVID-19 vaccination (85%); 4.41% received incomplete doses; 67.06% received full vaccination; and 28.23% received full vaccination with an additional booster dose. 53.61% of booster vaccinations used the same vaccine each time, while 46.39% received different vaccines. Regarding the reinfection rate, it was higher among the unvaccinated group compared to the vaccinated (20% versus 13.82%) but this difference was not statistically significant. Also, the length of stay in hospital during the reinfection was 6 days in both groups.
Conclusion: Although our results revealed no statistically significant difference between the vaccinated and unvaccinated groups regarding the reinfection rate. But, it may show a piece of evidence that COVID-19 vaccination plays an important clinical role in reducing the severity of COVID-19 infection.